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Verified answer
1.40 cm=4*10^-1F=k.q1.q2/r^2
=9*10^9.12.-4/(4*10^-1)^2
=108*10^9.-4/16*10^-2
=-108*10^9/4*10-2
=-27*10^11 N
2.20 cm=2*10-1
F=k.q1.q2/r^2
18=9*10^9.10-8.q2/(2*10^-1)^2
18=9*10^1q2/4*10-2
18=9*10^3q2/4
18=2250q2
q2=18/2250
=8*10^-3 C
=0,008 C
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